Composition for dentures



s. ,E. NOYES 0 COMPOSITION FOR DENTURES Filed June 50, 1928 W s i4! A fivenfor:

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" :Afforne 1 Patented Dec. 9, 1930 UNITED STATES PATENT OFFICE $TANLEY E. NOYES, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO HARRISON-NOYES CHEMICAL CORPORATION, LTD., OF LONG BEACH, CALIFORNIA, A CORPORATION OF CALIFORNIA COMPOSITION FOR DENTURES Application filed. June 30, 1928.

This invention relates to dentures and more particularly pertains to an improve ment in materials used in making the same.

The search for a suitable material for use in making dentures has been relentlessly followed by the dental profession for years. Some materials are satisfactory in one respect, but fail in another. It was not until the phenol condensations product, condensite or for example, the more commonly known bakelite, came upon the market that anything approaching satisfaction was available, but condensite has developed a serious defect that makes it almost worthless. It has insufficient tensile strength. The other properties of condensite fulfill so perfectly the requirements of the profession that it became paramount to provide a means of strengthening condensite.

The object of this invention is to provide such a means whereby this particular mate rial can be reinforced and still maintain its physical properties so essential to the making of dentures.

It was found that attempts to incorporate a foreign material into the composition were unsuccessful, mainly because of the conditions under which the material had to be worked. But from these attempts, there was developed a means of reenforcing which has proven successful.

I do not attempt to expound the theory, nor do I attempt to explain the chemical reactions involved. lVhat I do know is this; that if a piece of fabric, such as linen or silk is impregnated with condensite at a certain stage of evaporation of this product and the fabric allowed to cool without curing, the result is a hard, tough product that has some flexibility. In this stage, the impregnated fabric is a commercial product and is contemplated to be used in combination with semi-cured condensite in a manner of reenforcing as will be set forth by a more detailed description.

In the accompanying drawing:

Fig. 1 shows a denture reenforced by strips of fabric laid in a manner that has been calculated to best withstand the strains;

Serial No. 289,365.

densite and completely covered therewith at all points, are strips 10 of the pre treated reenforcing material. These strips may be of any desired width and where called upon to stand excessive strain would naturally be wider than those designed to stand a lesser strain. They may also be laid in a line calculated to receive a tensile, rather than a compressive strain and where it is necessary to withstand any undue strains, the strips may be doubled, or trebled and in this way, a denture reenforced at all points comparable to the strains put upon it will be produced.

In Figs. 3 and 4;, a pre-treated fabric is shown impregnated with semi-cured condensite. The fabric 15 is thoroughly impregnated by the solution of condensite which also forms a covering on all sides. The impregnation of the fabric is obtained by dipping the fabric into a solution of condensite during the process of evaporation at the point of evaporation where the solution shows signs of becoming viscous. The fabric after becoming thoroughly saturated is slowly dried, whereupon it becomes hard and tough and slightly flexible. In this stage, it may be said to be semi-cured and upon heating becomes ductile and almost viscous.

The composition, condensite, which is used in combination with the ore-treated fabric is forced into the molds to form dentures, and the strips of reenforcing material incorporated therein in the manner described to obtain the best results of reenforcing. Care must be taken that every part of the strips including the ends is contained within the body of the denture. After the denture is molded, it is heat-treated, until the mass has become an integral posed of condenslte.

become homogeneous. Tests have shown that after heat treatment, the pre-treated material has become an integral part of the denture and has strengthened the composition from five to ten times its original strength. I

Since I contemplate selling the pre-treated fabric in sheets and think it best to use it in strips, I have shown a sheet B of pie-treated fabric in Fig. 4, and suggest how it may be torn or cut into strips 10, for use.

The invention as has been disclosed, consists in pre-treating a fabric material with a solution of condensite to make it afterwards part of a denture com- I am aware that other fabrics besides silks and linens may be advantageously employed,

I therefore do not confine myself to these two fabrics.

I claim: I

1. In a denture composed of a phenol-con-' densation product, reenforcing strips of a textile fabric impregnated with the semicured product and thereafter slowly dried, the strips being positioned within said denture to withstand strains.

2. In a denture composed of a phenol condensation product, reenforcing strips of a textile fabric impregnated with the semi-cured product and thereafter slowly dried, the strips being positioned in. said denture in a manner as to make the reenforcinglstrength comparable to the straininvolved at different points in saiddenture. 7

3. In combination with a phenol condensation product, a. textile fabric impregnated with the semi-cured product and thereafter slowly dried, the fabric being adapted to be embedded in said product and to become an integral part thereof by heating.

In testimony whereof, I have aflixe'd my signature.

STANLEY E. NOYES. 

